Fix Shopify-Facebook Shop Integration

My Shopify store (yourstore.myshopify.com) refuses to link with Facebook Shop. Each time I reach the account-linking step the screen throws a “Something went wrong” message, even though all requested permissions are already granted. I need someone who really knows the Shopify → Meta Commerce channel to jump in, clear whatever is blocking the handshake, and prove the connection works.

Scope
• Diagnose and eliminate the error that appears during account linking.
• Complete the Shopify-Facebook channel setup and ensure products start syncing.
• Walk me through (screenshare or screenshots) so I can see the fix and replicate basic checks myself.

Key points
• No custom domain yet—store is still on the free “.myshopify.com” address.
• I may have experimented with a third-party plugin in the past; treat the environment as potentially “dirty” and clean conflicts if needed.
• Target turnaround: 1–2 days max.
• Budget is ₹1,000–1,200, payable via UPI/PhonePe the moment the test sync shows green ticks in Commerce Manager.

Access will be provided through Shopify collaborator access plus temporary admin rights on Business Manager. Let me know your plan of attack and how soon you can start.